AC Running Constantly? Here’s What Central Oregon Homeowners Should Know

drewjhvac
Aug 11, 2025
2 min read

When summer heatwaves hit Bend and the rest of Central Oregon, many homeowners notice something unsettling—your AC seems to run all day long. While it’s normal for air conditioners to work harder in extreme heat, running nonstop can signal underlying issues that cost you more in energy bills and reduce system lifespan.

Let’s break down why this happens and what you can do about it.

Why Your AC Runs Constantly During Heatwaves

Central Oregon’s high-desert climate brings unique challenges. Afternoon temperatures can soar into the triple digits, and the dry air makes it harder for your body to feel cool even when your thermostat is set low. In this kind of weather, your AC may struggle to reach your desired temperature—especially if:

Your home has large west-facing windows that trap heat in the afternoon
Your attic insulation is inadequate, letting heat seep in from above
You have an older or undersized AC unit that can’t keep up with the demand

Sometimes, running continuously is the only way your AC can maintain a safe indoor temperature during extreme heat. But if it’s happening every day—or even on moderate days—it’s worth looking deeper.

Common Causes & Fixes for an AC That Runs All Day

1. Undersized or Oversized AC Unit

If your unit isn’t matched to your home’s square footage and cooling needs, it will either:

Undersized: Run constantly without ever fully cooling the space
Oversized: Short cycle and fail to properly dehumidify or cool evenly

Solution: Schedule a professional load calculation to confirm your system size.

2. Dirty Air Filter or Clogged Coils

Dust and debris—especially common in Central Oregon’s dusty summers—restrict airflow and make your AC work harder.

Solution: Replace filters every 1–3 months during summer. Have your coils cleaned at least once a year.

3. Leaky Ductwork

If conditioned air is escaping into the attic or crawlspace, your AC must run longer to compensate.

Solution: Have your ducts inspected and sealed for efficiency.

4. Poor Home Insulation or Air Leaks

Older homes in Bend may lack adequate insulation, letting cool air escape and hot air enter.

Solution: Seal windows and doors, and consider upgrading attic insulation to modern R-values.

5. Thermostat Settings & Placement

If your thermostat is near a sunny window or heat-producing appliance, it may think the home is warmer than it actually is.

Solution: Adjust settings, relocate the thermostat, or upgrade to a smart thermostat for more accurate control.

How to Help Your AC Keep Up in Central Oregon Heat

Even if your AC is in top shape, these steps can help reduce runtime and lower energy bills:

Use blackout curtains or blinds during the hottest part of the day
Run ceiling fans to circulate cool air
Avoid heat-generating appliances like ovens during peak hours
Schedule preventive maintenance before the hottest months

Stay Cool and Protect Your System

If your AC is running nonstop—even on milder days—it’s time to have it inspected. A simple tune-up or targeted repair could restore efficiency, prevent breakdowns, and keep you comfortable all summer long.

Don’t wait until your AC gives out in the middle of a heatwave.Schedule a Cooling Performance Inspection with our Bend, Oregon HVAC team today.